<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
</head>
<body>

    <div id="root">
        姓：<input type="text" v-model="firstName"><br>
        名：<input type="text" v-model="lastName"><br>
        姓名：<span>{{fullName}}</span>
    </div>
</body>
<script>
    const vm = new Vue({
        el:'#root',
        data:{
            firstName:'张',
            lastName:'三'
        },
        computed:{
            // 完整写法
            // fullName:{               
            //     get(){
            //         return this.firstName + '-' + this.lastName
            //     },
            //     set(value){
            //         const arr = value.split('-')
            //         this.firstName = arr[0]
            //         this.lastName = arr[1]
            //     }
            // }
            // 简写
            fullName(){
                return this.firstName + '-' + this.lastName
            }
            
        }
    })
</script>
</html>